T1CookieExpires.seq - RTO is updated correctly if T1-cookie timer expires for a INIT message
To check that if T1-cookie expires on a destination address then the
value of RTO is updated correctly for that address.
./T1CookieExpires.seq [-tooloption ...] -pkt ./T1CookieExpires.def
-tooloption : v6eval tool option
See Also: ../common/STD_PKT_COMMON.def
../common/SCTP_COMMON.def
Association is not established between endpoint A and B. Arrange the
data in Endpoint A such that COOKIE-ACK is not sent in response to
COOKIE-ECHO message.
Endpoint A Endpoint B ULP
(CLOSED) (COOKIE-ECHOED)
<---------------- COOKIE-ECHO
Don't send Start T1-cookie timer
COOKIE-ACK message |
| T1-cookie timer expires
|
<---------------- COOKIE-ECHO
Restart T1-cookie Timer
TEST DESCRIPTION:
1. Attempt to make an association from endpoint B to endpoint A by
Sending COOKIE-ECHO message from endpoint B.
Record the message sequence using a signal emulator.
2. Let the timer T1-cookie expire. COOKIE-ECHO message will be retransmitted.
Note the timer. Don't send COOKIE-ACK for the retransmitted COOKIE-ECHO
message. T1-cookie will be expired again and again COOKIE-ECHO message will
be retransmitted. Record the message sequence using a signal emulator.
3. Check A: Value of the T1-cookie RTO is updated correctly.
1. If configure of MAX_INIT_RETRANS is not lager enough, test will exit
even if RTO is not up to RTO.MAX.
2. If the retransmit time is 0.5s less or greater than RTO, do accept it
because we can not exactly calculate it.
RFC 4960
4. SCTP Association State Diagram
Notes:
3) If the T1-cookie timer expires, the endpoint MUST retransmit
COOKIE ECHO and restart the T1-cookie timer without changing
state. This MUST be repeated up to 'Max.Init.Retransmits' times.
After that, the endpoint MUST abort the initialization process
and report the error to the SCTP user.